Mortgage Servicing Rights and Mortgage Servicing Activity (Changes in the Carrying Amount of Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortage Servicing Rights Amortized Value [Roll Forward]
Mortgage Servicing Rights Beginning of Period	$ 22,011	$ 22,760	$ 21,316
Mortgage Servicing Rights Additions	619	3,049	4,952
Amortization of Mortgage Servicing Rights (MSRs)	(3,693)	(3,798)	(4,573)
Mortgage Servicing Rights, End of Period	18,937	22,011	22,760
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Mortgage Servicing rights Valuation Allowance Beginning of Period	(955)	(282)	(2,564)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	556	(673)	2,282
Mortgage Servicing rights Valuation Allowance, End of Period	(399)	(955)	(282)
MSRs, net carrying balance	18,538	21,056	22,478
Fair value at end of period	19,149	21,228	23,041
Mortgage Servicing Rights | Citizens Republic Bancorp
Mortage Servicing Rights Amortized Value [Roll Forward]
Addition of Citizens' MSR's on Acquisition Date	$ 0	$ 0	$ 1,065